PORTLAND, OR - JUNE 04: A left-wing protester is arrested at a rally on June 4, 2017 in Portland, Oregon. A protest dubbed 'Trump Free Speech' by organizers was met by a large contingent of counter-demonstrators who viewed the protest as a promotion of racNatalie Behring/Getty Images

Hundreds of anti-fascist organizers and others descended on downtown Portland, Oregon, on Sunday to face off against a smaller but vocal contingent of right-wing demonstrators just nine days after a white supremacist allegedly murdered two people and wounded another, CNN reported.

Mayor Ted Wheeler had asked the federal government to revoke permits for two right-wing "free speech" events, including Sunday's Trump Free Speech Rally, in the wake of the murders. But organizers Patriot Prayer ended up being allowed to host the event, albeit with heavy security; riot police and federal agents with body armor, batons and long arms lined the streets, while loudspeakers announced movement restrictions for attendees of both the Trump event and counter-demonstrations.

Attendees included some of the biggest names on the so-called alt right, the loosely organized and mostly digital network of white nationalists, supremacists and other far-right activists which sprung to prominence amid President Donald Trump's rise to power. Kyle Chapman, the white nationalist who won internet fame for clubbing anti-fascists at a prior event, was there, as well as internet troll Tim Gionet (known online by the username "Baked Alaska").

The situation quickly escalated, according to FOX 12 Oregon's live feed. At one point, what sounded like flashbangs could be heard in the distance, along with wafting clouds of smoke, tear gas or both.

The Portland Police posted photos of seized weapons — mostly improvised clubs and sticks — as well as said they were clearing Chapman Square, where one of the counter-protests was being held. Authorities also made a number of arrests.

Oregon Public Broadcasting's Bryan M. Vance initially tweeted the police were "incredibly prepared," but less than 20 minutes later posted a photo of an anti-fascist activist who had been shot with a rubber bullet.

Here's some more scenes from the day, as captured by media on the scene:

A far-right protester holds a sign that says "All my heros kill commies" at a pro-Trump demonstration in Portland, Oregon, on June 4, 2017.Natalie Behring/Getty ImagesA left-wing protester is arrested at a demonstration in Portland, Oregon, on June 4, 2017.Natalie Behring/Getty ImagesArmed police officers watch for trouble at a demonstration in Portland, Oregon, on June 4, 2017.Scott Olson/Getty ImagesA helmet-wearing Trump supporter waves a flag at a demonstration in Portland, Oregon, on June 4, 2017.Scott Olson/Getty ImagesA protester waves at police at a demonstration in Portland, Oregon, on June 4, 2017.Scott Olson/Getty ImagesPolice guard a demonstration in Portland, Oregon, on June 4, 2017.Kristena Hansen/APRight-wingers cheer the arrest of left wing counter-protesters at a demonstration in Portland, Oregon, on June 4, 2017.Natalie Behring/Getty Images

This is a breaking news story and may be updated as more information becomes available.